Aerosol decadal trends (I): In-situ optical measurements at gaw and improve stations




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НазваниеAerosol decadal trends (I): In-situ optical measurements at gaw and improve stations
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Aerosol decadal trends (I): In-situ optical measurements at GAW and IMPROVE stations


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M. Collaud Coen1, E. Andrews2,3, A. Asmi4, U. Baltensperger5, N. Bukowiecki5, D. Day6, M. Fiebig7, A.-M. Fjaeraa7, H. Flentje8, A. Jefferson2, S. G. Jennings9, G. Kouvarakis10, H. Lihavainen11, C. Lund Myhre7, W. C. Malm6, N. Mihapopoulos10 , J. V. Molenar12, C. O’Dowd9, J.A. Ogren3, B. A. Schichtel13, P. Sheridan3, A. Virkulla4, E. Weingartner5, R. Weller14, and P. Laj15


1Federal Office of Meteorology and Climatology, MeteoSwiss, CH-1530 Payerne, Switzerland

2University of Colorado, CIRES, Boulder, Colorado, 80305, USA

3National Oceanic and Atmospheric Administration, Earth System Research Laboratory, Boulder, Colorado, 80305, USA

4Department of Physics, University of Helsinki, P.O. Box 64, Helsinki, Finland

5Paul Scherrer Institute, Laboratory of Atmospheric Chemistry, Villigen PSI, CH-5232, Switzerland

6Colorado State University; Cooperative Institute for Research in the Atmosphere; Fort Collins, CO 80523; USA

7NILU - Norwegian Institute for Air Research, Instituttveien 18, 2027 Kjeller, Norway

8German Weather Service, Meteorological Observatory Hohenpeissenberg, Albin-Schwaiger-Weg 10, D-82383 Hohenpeißenberg, Germany

9School of Physics, National University of Ireland Galway, Galway, Co. Galway, Ireland

10Environmental Chemistry Processes Laboratory, Dept. of Chemistry, University of Crete, 71003 Heraklion Crete, Greece

11Finnish Meteorological Institute; Erik Palmenin aukio 1; FI-00560 Helsinki; Finland

12Air Resource Specialists, Inc.; 1901 Sharp Point Drive, Suite E; Ft. Collins, CO 80525; USA

13National Park Service; Fort Collins, CO 80523; USA

14Alfred-Wegener-Institute for Polar and Marine Research, Am Handelshafen 12, D-

27570 Bremerhaven, Germany

15UJF-Grenoble 1 / CNRS, LGGE UMR 5183, Grenoble, F-38041, France


Correspondence to: Martine Collaud Coen (martine.collaud@meteoswiss.ch)


Keywords: aerosol optical properties, light scattering and absorption, long-term trends, climatology.


Abstract


Currently many ground-based atmospheric stations include in-situ measurements of aerosol physical and optical properties, resulting in more than 20 long-term (> 10 years) aerosol measurement sites in the Northern Hemisphere and Antarctica. Most of these sites are located at remote locations and monitor the aerosol particle number concentration, wavelength-dependent light scattering, backscattering, and absorption coefficients. The existence of these multi-year datasets enables the analysis of long-term trends of these aerosol parameters, of the derived light scattering Ångström exponent and back-scatterbackscatter fraction. Since the aerosol variables are not normally distributed, three different methods (the seasonal Mann-Kendall test associated with the Sen’s slope, the generalized least squares fit associated with an autoregressive bootstrap algorithm for confidence intervals, and the least-mean square fit applied to logarithms of the data) were applied to detect the long-term trends and their magnitudes for each month. To allow a comparison among measurement sites with varying length of data records, trends on the most recent 10 and 15 years periods were calculated. No significant trends were found for the three continental European sites. Statistically significant trends were found for the two European marine sites but the signs of the trends varied with aerosol property and location. Statistically significant decreasing trends for both scattering and absorption coefficient were found for most North American stations, although positive trends were found for a few desert and high-altitude sites. No significant trends in scattering coefficient were found for the Arctic or Antarctic stations, whereas the Arctic station had a negative trend in absorption coefficient.


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